An image-processing device creates a sequential print-processing schedule for inputted print jobs on the basis of supply conditions of required resources, such as printing media and the like, and of attribute information of the print jobs. Before execution of a print job, the image-processing device acquires attribute information for the leading job in a print-waiting queue, and determines whether or not resources requested for that print job are supplied. If not, execution of that printing job is inhibited, and the next print job in line is performed. Thus, productivity of the device can be improved. However, it is also determined whether or not the print job meets a predetermined condition. If so, other jobs are blocked from overtaking the inhibited job and being performed first. The inhibited job waits until resources are supplied, and thus re-prioritization of the print jobs against the will of a user is prevented.